I am so sorry you feel this way. I remember thinking these things too when I was in school (especially high school -what a horrible time that was)... I wish I had some advice to give you. Some words that will make all that you are going through easier. Our illness is hard for those who have never gone through it to understand. It makes us seem... distant? Do you have a councilor at school you can talk to? Or maybe speak to your family doctor? There are some great therapy programs out there that can help.
In the meantime the people on here are really great and friendly. You can always talk here and you are never alone